Merge pull request #52 from sophokles73/osgi-fixes

Exported packages list updates
CoAPBench and BenchmarkServer now have reduced output. It can be enabled again by a flag -v
Merged with current branch
Changed level of periodic logging message.
Merge branch 'coap-18' of https://github.com/mkovatsc/Californium into coap-18
Fixed missing import.
generate sources artifacts
Merge pull request #54 from jvermillard/attach-sources

Generate sources artifacts for Maven.
Add properties to Request for accessing an authenticated client's
Principal
adapt list of exported packages in OSGi bundle to reflect changed
package structure, add missing classpath entry

Conflicts:
	cf-osgi/pom.xml
Adopt latest changes
Add maven plug-in generated classpath entries